<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title></title>
		<style type="text/css">
			/* html {
				font-size: 30px;
			} */

			div {
				width: 12.5rem;
				height: 18.75rem;
				background-color: orange;
			}

			@media screen and (min-width:768px) {
				html {
					font-size: 30px;
				}
			}

			@media screen and (min-width:992px) {
				html {
					font-size: 20px;
				}
			}

			@media screen and (min-width:1200px) {
				html {
					font-size: 10px;
				}
			}
		</style>
	</head>
	<body>
		<div>博为峰</div>
	</body>
</html>
